Biology, 20.12.2020 14:50 rebekahlm

3 a Why is it useful for crabs that live on the sea shore to have both lungs and gills.
b If equal volumes of blood go through the lungs and gills of light-blue
soldier crabs, suggest the mean percentage of oxygen that would be found in
the blood having gone through only the gills. Explain your reasoning.
c What does this tell you about how efficient both lungs and gills are in these
crabs?
d Suggest three reasons for this difference.

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3 a Why is it useful for crabs that live on the sea shore to have both lungs and gills.
b If...